src/net/sourceforge/plantuml/utils/Direction.java
<filename>src/net/sourceforge/plantuml/utils/Direction.java// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.utils;

import net.sourceforge.plantuml.klimt.geom.XPoint2D;

public enum Direction {
	RIGHT, LEFT, DOWN, UP;

	public Direction getInv() {
		if (this == RIGHT)
			return LEFT;

		if (this == LEFT)
			return RIGHT;

		if (this == DOWN)
			return UP;

		if (this == UP)
			return DOWN;

		throw new IllegalStateException();
	}

	public String getShortCode() {
		return name().substring(0, 1);
	}

	public static Direction fromChar(char c) {
		if (c == '<') {
			return Direction.LEFT;
		}
		if (c == '>') {
			return Direction.RIGHT;
		}
		if (c == '^') {
			return Direction.UP;
		}
		return Direction.DOWN;
	}

	public Direction clockwise() {
		if (this == RIGHT) {
			return DOWN;
		}
		if (this == LEFT) {
			return UP;
		}
		if (this == DOWN) {
			return LEFT;
		}
		if (this == UP) {
			return RIGHT;
		}
		throw new IllegalStateException();
	}

	public static Direction leftOrRight(XPoint2D p1, XPoint2D p2) {
		if (p1.getX() < p2.getX()) {
			return Direction.LEFT;
		}
		if (p1.getX() > p2.getX()) {
			return Direction.RIGHT;
		}
		throw new IllegalArgumentException();
	}

	public static Direction fromVector(XPoint2D p1, XPoint2D p2) {
		final double x1 = p1.getX();
		final double y1 = p1.getY();
		final double x2 = p2.getX();
		final double y2 = p2.getY();
		if (x1 == x2 && y1 == y2) {
			return null;
		}
		if (x1 == x2) {
			if (y2 > y1) {
				return Direction.DOWN;
			}
			return Direction.UP;
		}
		if (y1 == y2) {
			if (x2 > x1) {
				return Direction.RIGHT;
			}
			return Direction.LEFT;
		}
		throw new IllegalArgumentException("Not a H or V line!");

	}

	public static Direction lazzyValueOf(String s) {
		s = s.toUpperCase();
		if ("TOP".equals(s))
			return Direction.UP;
		if ("BOTTOM".equals(s))
			return Direction.DOWN;
		return valueOf(s);
	}
}
